Cosmetic composition comprising a fatty-chain alkoxysilane and a cationic or nonionic surfactant

ABSTRACT

The present invention relates to a cosmetic composition comprising: at least 0.1% by weight of one or more fatty-chain alkoxysilanes of formula (I) below: R 1 Si(OR 2 ) 3  (I) in which R 1  represents a linear or branched alkyl or alkenyl group, comprising from 7 to 18 carbon atoms, and R 2  represents a linear or branched alkyl group comprising from 1 to 6 carbon atoms, and one or more surfactant(s) chosen from cationic surfactants and nonionic surfactants, and mixtures thereof. The invention also relates to a cosmetic treatment process using the said composition, and also to the use of the said composition for haircare and skincare.

The present invention relates to a cosmetic composition comprising, in acosmetically acceptable medium, one or more fatty-chain alkoxysilanesand one or more surfactants chosen from cationic surfactants andnonionic surfactants.

The present invention also relates to the use of the said compositionfor caring for keratin materials, such as human skin and human keratinfibres and in particular the hair, and also to a cosmetic process fortreating keratin materials using such a composition.

A recurrent problem in the field of cosmetic haircare consists in caringfor keratin fibres subjected to various external attacking factors.Specifically, these fibres may be subject to attack of various origins,such as mechanical attack, for example linked to disentangling orblow-drying, or alternatively chemical attack, for example followingdyeing or permanent-waving.

Attack due to chemical and mechanical treatments has consequencesespecially on the qualities of the keratin fibre and may lead todifficult disentangling at the time of washing the hair, on dry hairand/or wet hair, and also to degradation of the surface properties ofthe fibres, which become non-smooth and irregular at the surface, moreparticularly when the hair is dry.

Care products exist that can limit these phenomena. However, thesesolutions are not always sufficiently effective and are not sufficientlyshampoo-resistant.

The prior-art compositions that can facilitate disentangling bysoftening the keratin fibre and that afford gloss, softness anduniformity to dry hair essentially comprise cationic surfactants, fattysubstances, silicones and cationic polymers.

After having been applied, these compositions are rinsed out, and thecosmetic agents, which are only lightly deposited on the keratin fibres,are generally removed at the time of the next wash.

Thus, the application of these compositions must be repeated after eachwash, in order to treat the hair and to facilitate its conditioning.

There is thus a need for compositions that can form a material or thatcan deposit care active agents uniformly onto and/or into the keratinfibres, in a manner that is resistant to shampooing several times.

Furthermore, the consumers wish to be able to wash their faces and bodywithout drying their skin, and potentially treating it in order to givea good slip to their skin.

Products exist, that are called shower gels, based on anionicsurfactants. However such compositions often leave an insufficientdeposit on the skin. It is possible to improve the treating effect ofsuch compositions by adding cationic compounds. However, this solutionis not always fully satisfying considering the eco-toxicity of thematerials used.

International patent application WO 2004/012 691 discloses the cosmeticuse of silanes for improving the condition of the hair.

Patent application EP 0 159 628 proposes compositions for reinforcingthe elasticity of the hair, comprising an alkyltrialkoxysilane.

Moreover, patent application EP 1 736 139 describes a hair treatmentcomposition comprising an alkoxysilane, an organic acid and water, thepH of the composition being between 2 and 5.

Finally, patent application EP 0 877 027 discloses a compositioncomprising an organosilane and a particular polyol.

The Applicant has now discovered, surprisingly, that a combination of aparticular fatty-chain alkoxysilane with at least one cationic and/ornonionic surfactant can afford efficient and long-lasting treatment ofthe hair and the skin, and thus facilitate their conditioning.

In particular, such a composition can, firstly, treat the hair, and,secondly, give cosmetic effects that are resistant to shampooing severaltimes.

One subject of the present invention is thus a cosmetic compositioncomprising:

-   -   at least 0.1% by weight, relative to the total weight of the        composition, of one or more fatty-chain alkoxysilanes of        formula (I) below:

R₁Si(OR₂)₃  (I)

in which R₁ represents a linear or branched alkyl or alkenyl groupcomprising from 7 to 18 carbon atoms, and R₂ represents a linear orbranched alkyl group comprising from 1 to 6 carbon atoms, and

-   -   one or more surfactant(s) chosen from cationic surfactants and        nonionic surfactants, and mixtures thereof.

The present invention further concerns a cosmetic composition,obtainable by mixing the following ingredients:

-   -   at least 0.1% by weight, relative to the total weight of the        composition, of one or more fatty-chain alkoxysilanes of        formula (I) below:

R₁Si(OR₂)₃  (I)

in which R₁ represents a linear or branched alkyl or alkenyl groupcomprising from 7 to 18 carbon atoms, and R₂ represents a linear orbranched alkyl group comprising from 1 to 6 carbon atoms, and

-   -   one or more surfactant(s) chosen from cationic surfactants and        nonionic surfactants, and mixtures thereof.

The composition of the present invention proves to be particularlysuitable for caring for the hair and the skin and also makes it possibleto obtain very good working qualities such as particularly easyapplication and good rinseability.

The composition according to the invention gives the hair excellentcosmetic properties, and in particular promotes the disentangling,suppleness and smoothness of the hair.

In addition, the feel of the hair and of the skin after treatment usingthe composition according to the invention is particularly pleasant.

Finally, the conditioning properties obtained using the compositionaccording to the invention are shampoo- and washing-resistant.

Another subject of the invention consists of a cosmetic process fortreating keratin materials, especially human skin and human keratinfibres such as the hair, which consists in applying to the hair aneffective amount of a composition according to the invention.

In particular, the composition according to the invention may be rinsedout or left in, optionally applied under the effect of heat, andoptionally combined with chemical and/or mechanical hair treatments.

A subject of the invention is also the use of the composition accordingto the invention for caring for keratin materials, such as human skinand human keratin fibres such as in particular the hair.

Other subject-matters, characteristics, aspects and advantages of theinvention will become even more clearly apparent on reading thedescription and examples which follow.

According to the present invention, the composition comprises one ormore fatty-chain alkoxysilanes.

The fatty-chain alkoxysilane(s) that may be used in the compositionaccording to the invention are those corresponding to formula (I) below:

R₁Si(OR₂)₃  (I)

in which R¹ represents a linear or branched alkyl or alkenyl groupcomprising from 7 to 18 carbon atoms, and R₂ represents a linear orbranched alkyl group comprising from 1 to 6 carbon atoms and preferablyfrom 1 to 4 carbon atoms, and even more preferentially the ethyl group.

Said fatty-chain alkoxysilane can be present in the composition underthe form of a compound of formula (I) above, and/or under the form ofone or more oligomer(s) of such a compound.

In formula (I) above, R₁ being an alkyl or alkenyl group and R₂ being analkyl group, these groups comprise only carbon and hydrogen atoms.

Preferably, R₂ represents an alkyl group comprising from 1 to 4 carbonatoms, better still a linear alkyl group comprising from 1 to 4 carbonatoms, and preferably the ethyl group.

Preferably, R₁ represents an alkyl group and even more preferentially alinear alkyl group.

Preferably, the fatty-chain alkoxysilane is chosen fromoctyltriethoxysilane, dodecyltriethoxysilane, octadecyltriethoxysilaneand hexadecyltriethoxysilane.

More particularly, the fatty-chain alkoxysilane according to theinvention is octyltriethoxysilane (OTES).

The alkoxysilane(s) of formula (I) are present in the compositionaccording to the invention in proportions of at least 0.1% by weight,preferably ranging from 0.1 to 20% by weight, more preferably from 0.5to 18% by weight and better still from 2 to 15% by weight, relative tothe total weight of the composition.

According to a first embodiment of the invention, the compositioncomprises one or more cationic surfactants.

The cationic surfactant(s) that can be used in the compositions of thepresent invention comprise, for example, salts of optionallypolyoxyalkylenated primary, secondary or tertiary fatty amines,quaternary ammonium salts, and mixtures thereof.

Examples of quaternary ammonium salts that may especially be mentionedinclude:

-   -   those corresponding to the general formula (II) below:

in which the groups R₈ to R₁₁, which may be identical or different,represent a linear or branched aliphatic group comprising from 1 to 30carbon atoms or an aromatic group such as aryl or alkylaryl, at leastone of the groups R₈ to R₁₁ comprising from 8 to 30 carbon atoms andpreferably from 12 to 24 carbon atoms. The aliphatic groups may compriseheteroatoms such as, in particular, oxygen, nitrogen, sulfur andhalogens.

The aliphatic groups are chosen, for example, from C₁-C₃₀ alkyl, C₁-C₃₀alkoxy, polyoxy(C₂-C₆)alkylene, C₁-C₃₀ alkylamide,(C₁₂-C₂₂)alkylamido(C₂-C₆)alkyl, (C₁₂-C₂₂)alkylacetate, C₁-C₃₀hydroxyalkyl, X⁻ is an anionic counterion chosen from halides,phosphates, acetates, lactates, (C₁-C₄)alkyl sulfates, and (C₁-C₄)alkyl-or (C₁-C₄)alkylarylsulfonates.

Preference is given, among the quaternary ammonium salts of formula(II), on the one hand, to tetraalkylammonium chlorides, such as, forexample, dialkyldimethylammonium or alkyltrimethylammonium chlorides inwhich the alkyl group comprises approximately from 12 to 22 carbonatoms, in particular behenyltrimethylammonium chloride,distearyldimethylammonium chloride, cetyltrimethylammonium chloride orbenzyldimethylstearyl-ammonium chloride, or also, on the other hand, todistearoylethylhydroxyethylmethylammonium methosulfate,dipalmitoylethylhydroxyethylammonium methosulfate ordistearoylethylhydroxyethylammonium methosulfate, or also, finally, topalmitylamidopropyltrimethylammonium chloride orstearamidopropyldimethyl(myristyl acetate)ammonium chloride, sold underthe name Ceraphyl® 70 by Van Dyk.

-   -   quaternary ammonium salts of imidazoline, for instance those of        formula (III) below:

in which R₁₂ represents an alkyl or alkenyl group comprising from 8 to30 carbon atoms, for example fatty acid derivatives of tallow, R₁₃represents a hydrogen atom, a C₁-C₄ alkyl group or an alkyl or alkenylgroup comprising from 8 to 30 carbon atoms, R₁₄ represents a C₁-C₄ alkylgroup, R₁₅ represents a hydrogen atom or a C₁-C₄ alkyl group, X⁻ is ananion chosen from the group of halides, phosphates, acetates, lactates,(C₁-C₄)alkyl sulfates and (C₁-C₄)alkyl- or (C₁-C₄)alkylaryl-sulfonates.R₁₂ and R₁₃ preferably denote a mixture of alkyl or alkenyl groupscomprising from 12 to 21 carbon atoms, for example tallow fatty acidderivatives, R₁₄ denotes a methyl group, and R₁₅ denotes a hydrogenatom. Such a product is, for example, sold under the name Rewoquat® W 75by the company Rewo,

-   -   quaternary diammonium or triammonium salts, particularly of        formula (IV) below:

in which R₁₆ denotes an alkyl group comprising from about 16 to 30carbon atoms, optionally hydroxylated and/or interrupted with one ormore oxygen atoms; R₁₇ is chosen from hydrogen, an alkyl groupcomprising from 1 to 4 carbon atoms or a group—(CH₂)₃—N⁺(R_(16a))(R_(17a))(R_(18a)); R_(16a), R_(17a), R_(18a), R₁₈,R₁₉, R₂₀ and R₂₁, which may be identical or different, are chosen fromhydrogen and an alkyl group comprising from 1 to 4 carbon atoms, and X⁻is an anion chosen from the group of halides, acetates, phosphates,nitrates, (C₁-C₄)alkyl sulfates and (C₁-C₄)alkyl- or(C₁-C₄)alkylaryl-sulfonates, in particular methyl sulfate and ethylsulfate. Such compounds are, for example, Finquat CT-P, available fromthe company Finetex (Quaternium 89), and Finquat CT, available from thecompany Finetex (Quaternium 75),

-   -   quaternary ammonium salts comprising one or more ester        functions, for instance those of formula (V) below:

in which:

R₂₂ is chosen from C₁-C₆ alkyl and C₁-C₆ hydroxyalkyl or dihydroxyalkylgroups;

R₂₃ is chosen from:

-   -   the group

-   -   linear or branched, saturated or unsaturated C₁-C₂₂        hydrocarbon-based groups R₂₇,    -   a hydrogen atom,

R₂₅ is chosen from:

-   -   the group

-   -   linear or branched, saturated or unsaturated C₁-C₆        hydrocarbon-based groups R₂₉,    -   a hydrogen atom,

R₂₄, R₂₆ and R₂₈, which may be identical or different, are chosen fromlinear or branched, saturated or unsaturated C₇-C₂₁ hydrocarbon-basedgroups;

r, s and t, which may be identical or different, are integers rangingfrom 2 to 6,

r1 and t1, which may be identical or different, are equal to 0 or 1,

r2+r1=2r and t1+t2=2t,

y is an integer ranging from 1 to 10,

x and z, which may be identical or different, are integers ranging from0 to 10,

X⁻ is a simple or complex, organic or mineral anion,

with the proviso that the sum x+y+z is from 1 to 15, that when x is 0,then R₂₃ denotes R₂₇ and that when z is 0, then R₂₅ denotes R₂₉.

The alkyl groups R₂₂ may be linear or branched, and more particularlylinear.

Preferably, R₂₂ denotes a methyl, ethyl, hydroxyethyl or dihydroxypropylgroup, and more particularly a methyl or ethyl group.

Advantageously, the sum x+y+z is from 1 to 10.

When R₂₃ is a hydrocarbon-based group R₂₇, it may be long and containfrom 12 to 22 carbon atoms, or may be short and contain from 1 to 3carbon atoms.

When R₂₅ is a hydrocarbon-based group R₂₉, it preferably contains 1 to 3carbon atoms.

Advantageously, R₂₄, R₂₆ and R₂₈, which may be identical or different,are chosen from linear or branched, saturated or unsaturated C₁₁-C₂₁hydrocarbon-based groups, and more particularly from linear or branched,saturated or unsaturated C₁₁-C₂₁ alkyl and alkenyl groups.

Preferably, x and z, which may be identical or different, are equal to 0or 1.

Advantageously, y is equal to 1.

Preferably, r, s and t, which may be identical or different, are equalto 2 or 3, and even more particularly are equal to 2.

The anion X⁻ is preferably a halide, preferably chloride, bromide oriodide, a (C₁-C₄)alkyl sulfate or a (C₁-C₄)alkyl- or(C₁-C₄)alkylaryl-sulfonate. However, methanesulfonate, phosphate,nitrate, tosylate, an anion derived from an organic acid, such asacetate or lactate, or any other anion that is compatible with theammonium containing an ester function, may be used.

The anion X⁻ is even more particularly chloride, methyl sulfate or ethylsulfate.

Use is made more particularly in the composition according to theinvention of the ammonium salts of formula (V) in which:

-   -   R₂₂ denotes a methyl or ethyl group,    -   x and y are equal to 1,    -   z is equal to 0 or 1,    -   r, s and t are equal to 2,    -   R₂₃ is chosen from:    -   the group

-   -   methyl, ethyl or C₁₄-C₂₂ hydrocarbon-based groups,    -   a hydrogen atom,    -   R₂₅ is chosen from:    -   the group

-   -   a hydrogen atom,    -   R₂₄, R₂₆ and R₂₈, which may be identical or different, are        chosen from linear or branched, saturated or unsaturated C₁₃-C₁₇        hydrocarbon-based groups, and more particularly from linear or        branched, saturated or unsaturated C₁₃-C₁₇ alkyl and alkenyl        groups.

The hydrocarbon-based groups are advantageously linear.

Among the compounds of formula (V), examples that may be mentionedinclude salts, especially the chloride or methyl sulfate, ofdiacyloxyethyldimethylammonium,diacyloxyethylhydroxy-ethylmethylammonium,monoacyloxyethyldihydroxyethylmethyl-ammonium,triacyloxyethylmethylammonium ormonoacyloxyethyl-hydroxyethyldimethylammonium, and mixtures thereof. Theacyl groups preferably contain 14 to 18 carbon atoms and are obtainedmore particularly from a plant oil such as palm oil or sunflower oil.When the compound contains several acyl groups, these groups may beidentical or different.

These products are obtained, for example, by direct esterification oftriethanolamine, triisopropanolamine, an alkyldiethanolamine or analkyldiisopropanolamine, which are optionally oxyalkylenated, with fattyacids or with fatty acid mixtures of plant or animal origin, or bytransesterification of the methyl esters thereof. This esterification isfollowed by a quaternization by means of an alkylating agent such as analkyl halide, preferably methyl or ethyl halide, a dialkyl sulfate,preferably methyl or ethyl sulfate, methyl methanesulfonate, methylpara-toluenesulfonate, glycol chlorohydrin or glycerol chlorohydrin.

Such compounds are, for example, sold under the names Dehyquart® byHenkel, Stepanquat® by Stepan, Noxamium® by Ceca or Rewoquat® WE 18 byRewo-Witco.

The composition according to the invention may contain, for example, amixture of quaternary ammonium monoester, diester and triester saltswith a weight majority of diester salts.

Mixtures of ammonium salts that may be used include, for example, themixture containing 15% to 30% by weight ofacyloxy-ethyldihydroxyethylmethylammonium methyl sulfate, 45% to 60% ofdiacyloxyethylhydroxyethylmethylammonium methyl sulfate and 15% to 30%of triacyloxyethylmethylammonium methyl sulfate, the acyl groups havingfrom 14 to 18 carbon atoms and originating from palm oil, which isoptionally partially hydrogenated.

It is also possible to use the ammonium salts containing at least oneester function that are described in U.S. Pat. No. 4,874,554 and U.S.Pat. No. 4,137,180.

Use may be made of behenoylhydroxypropyltrimethyl-ammonium chloride soldby KAO under the name Quartamin BTC 131.

Preferably, the ammonium salts containing at least one ester functioncontain two ester functions.

Among the cationic surfactants present in the composition according tothe invention, it is more particularly preferred to choosecetyltrimethylammonium, behenyltrimethylammonium anddipalmitoylethylhydroxyethylmethylammonium salts, and mixtures thereof,and more particularly behenyltrimethylammonium chloride,cetyltrimethylammonium chloride, anddipalmitoylethylhydroxyethyl-ammonium methosulfate, and mixturesthereof.

In this first embodiment, the cationic surfactant(s) are present in thecomposition according to the invention in preferential proportions of atleast 0.05% by weight, preferably ranging from 0.05% to 10% by weight,more preferentially from 0.1% to 5% by weight and better still from 0.5%to 5% by weight, relative to the total weight of the composition.

When the cationic surfactant(s) are present in the compositionsaccording to the invention, the weight ratio between the amount offatty-chain alkoxysilane(s), on the one hand, and the amount of cationicsurfactant(s), on the other hand, is preferably greater than or equal to1.

In one preferred embodiment, the weight ratio between the amount offatty-chain alkoxysilane(s), on the one hand, and the amount of cationicsurfactant(s), on the other hand, ranges from 1 to 100, even morepreferentially from 1 to 50 and better still from 2 to 20.

According to a first embodiment of the invention, the compositioncomprises one or more nonionic surfactants.

Examples of nonionic surfactants that may be used in the compositionused according to the invention are described, for example, in the“Handbook of Surfactants” by M. R. Porter, published by Blackie & Son(Glasgow and London), 1991, pp. 116-178. They are especially chosen frompolyethoxylated, polypropoxylated and/or polyglycerolated alcohols,α-diols and (C₁-C₂₀)alkylphenols, containing at least one fatty chaincomprising, for example, from 8 to 18 carbon atoms, the number ofethylene oxide and/or propylene oxide groups possibly ranging especiallyfrom 2 to 50, and the number of glycerol groups possibly rangingespecially from 2 to 30.

Mention may also be made of copolymers of ethylene oxide and propyleneoxide, optionally oxyethylenated fatty acid esters of sorbitan, fattyacid esters of sucrose, polyoxyalkylenated fatty acid esters, optionallyoxyalkylenated alkylpolyglycosides, alkylglucoside esters, derivativesof N-alkylglucamine and of N-acylmethylglucamine, aldobionamides andamine oxides.

Unless otherwise mentioned, the term “fatty” compound (for example afatty acid) denotes a compound comprising, in its main chain, at leastone saturated or unsaturated hydrocarbon-based chain, such as alkyl oralkenyl, containing at least 8 carbon atoms, preferably from 8 to 30carbon atoms, and even better still from 10 to 22 carbon atoms.

The mono- or polyglycosides that may be used in the invention are wellknown and may be represented more particularly by the general formula(II) below:

R₁O—(R₂O)_(t)(G)_(v)  (VI)

in which:

R₁ represents a linear or branched alkyl and/or alkenyl group,comprising from about 8 to 24 carbon atoms, or an alkylphenyl groupwhose linear or branched alkyl group comprises from 8 to 24 carbonatoms,

R₂ represents an alkylene group comprising from about 2 to 4 carbonatoms,

G represents a sugar unit comprising from 5 to 6 carbon atoms,

t denotes a value ranging from 0 to 10 and preferably 0 to 4, and

v denotes an integer ranging from 1 to 15.

Mono- or polyglycosides that are preferred in the present invention are(C₈-C₁₈)alkyl mono- or polyglycosides and are compounds of formula (VI)in which:

R₁ more particularly denotes a saturated or unsaturated, linear orbranched alkyl group comprising from 8 to 18 carbon atoms,

t denotes a value ranging from 0 to 3 and even more particularly isequal to 0,

G may denote glucose, fructose or galactose, preferably glucose.

The degree of polymerization, i.e. the value of v in formula (VI), mayrange from 1 to 15 and preferably from 1 to 4. The average degree ofpolymerization is more particularly between 1 and 2 and even morepreferentially from 1.1 to 1.5.

The glycoside bonds between the sugar units are of 1-6 or 1-4 type andpreferably of 1-4 type.

Examples of compounds of formula (VI) are especially caprylylglucoside,decylglucoside or caprylglucoside, laurylglucoside, cetearylglucosideand cocoglucoside, and mixtures thereof. These preferred compounds offormula (VI) are especially represented by the products sold by thecompany Cognis under the names Plantaren® (600 CS/U, 1200 and 2000) orPlantacare® (818, 1200 and 2000). It is also possible to use theproducts sold by the company SEPPIC under the names Triton CG 110 orOramix CG 110 and Triton CG 312 or Oramix® NS 10, the products sold bythe company BASF under the name Lutensol GD 70 or those sold by thecompany Chem Y under the name AG10 LK.

It is also possible to use, for example, (C₈-C₁₆)alkyl-1,4-polyglucosideas an aqueous 53% solution, sold by the company Cognis under thereference Plantacare® 818 UP.

Among the cited nonionic surfactants, optionally oxyalkylenatedalkylpolyglycosides are preferably used.

In this second embodiment, the nonionic surfactant(s) are present in thecomposition according to the invention in preferential proportions of atleast 0.1% by weight, preferably ranging from 0.1% to 50% by weight,more preferentially from 1% to 20% by weight and better still from 2% to10% by weight, relative to the total weight of the composition.

When the nonionic surfactant(s) are present in the composition accordingto the invention, the weight ratio between the amount of nonionicsurfactant(s), on the one hand, and the amount of fatty-chainalkoxysilane(s), on the other hand, is preferably greater than or equalto 0.05.

In one preferred embodiment, the weight ratio between the amount ofnonionic surfactant(s), on the one hand, and the amount of fatty-chainalkoxysilane(s), on the other hand, ranges from 0.1 to 50, even morepreferentially from 0.15 to 30 and better still from 0.2 to 5.

According to one preferred embodiment, the composition according to theinvention also comprises one or more thickeners.

For the purposes of the present invention, the term “thickener” means anagent which, when introduced at 1% by weight in an aqueous solution oran aqueous-alcoholic solution containing 30% ethanol, and at pH 7, makesit possible to achieve a viscosity of at least 100 mPa·s (100 cPs) andpreferably of at least 500 mPa·s (500 cPs), at 25° C. and at a shearrate of 1 s⁻¹. This viscosity may be measured using a cone/plateviscometer (Haake R600 rheometer or the like).

The thickener or thickeners may be selected from fatty acid amidesobtained from C₁₀-C₃₀ carboxylic acid such as monoisopropanolamide,diethanolamide or monoethanolamide of coconut acids, monoethanolamide ofethoxylated carboxylic alkyl ether acid, preferably nonioniccellulose-based thickeners (hydroxyethylcellulose,hydroxypropylcellulose, carboxymethylcellulose), guar gum and itsnonionic derivatives such as hydroxypropyl guar, gums of microbialorigin such as xanthan gum, scleroglucan gum, crosslinked ornon-crosslinked homopolymers and copolymers based on acrylic acid,methacrylic acid or acrylamidopropanesulfonic acid, and associativepolymers, especially acrylic associative polymers or polyurethanes, asdescribed below.

The associative polymer(s) that can be used according to the inventionare water-soluble polymers which, in an aqueous medium, are capable ofreversible association with one another or with other molecules.

Their chemical structure comprises hydrophilic zones and hydrophobiczones characterized by at least one fatty chain preferably comprisingfrom 10 to 30 carbon atoms.

The associative polymer(s) that may be used according to the inventionmay be of anionic, cationic, amphoteric or nonionic type, for instancethe polymers sold under the names Pemulen TR1 or TR2 by the companyGoodrich, the INCI name of which is Acrylates/C10-30 Alkyl AcrylateCrosspolymer, Salcare SC90 by the company Ciba, Aculyn 22, 28, 33, 44 or46 by the company Röhm & Haas, and Elfacos T210 and T212 by the companyAkzo.

Among the cited thickeners, use is preferably made of nonioniccellulose-based thickeners, such as hydroxyethylcellulose, associativepolyurethanes and xanthan gum.

Preferably, the composition according to the invention comprises from0.01% to 20% by weight and better still from 0.1% to 10% by weight ofthickener(s) relative to the total weight of the composition.

In one particularly advantageous embodiment, the cosmetic compositionaccording to the invention also comprises one or more organic acids.

The term “organic acid” means any non-polymeric organic compoundcomprising two or more than two carbon atoms and one or more acidfunctions chosen from carboxylic acid, sulfonic acid and phosphoric acidfunctions.

Preferentially, the organic acid is not a surfactant.

Even more preferentially, the molecular weight of the organic acid isless than 250 and better still less than 200.

Even more preferentially, the organic acids according to the inventionare carboxylic acids and α-hydroxylated carboxylic acids or AHAs.

The organic acids may be amino acids.

The organic acid(s) are preferably chosen from acetic acid, propanoicacid, butanoic acid, lactic acid, malic acid, glycolic acid, ascorbicacid, maleic acid, phthalic acid, succinic acid, taurine, tartaric acid,arginine, glycine, glucuronic acid, gluconic acid and citric acid.

Even more preferentially still, the organic acid used in the compositionaccording to the invention is chosen from acetic acid, citric acid andlactic acid, and is preferably lactic acid.

In the composition, the organic acid(s) may be in free or salified form.

The organic acid(s) that may be used in the composition according to thepresent invention may be present in a content, expressed as free acids,ranging from 0.01% to 10% by weight, preferably in a content rangingfrom 0.1% to 8% by weight and even more preferentially in a contentranging from 0.2% to 5% by weight relative to the total weight of thecomposition.

The composition according to the invention may also comprise one or moreadditional surfactants chosen from anionic, amphoteric and/orzwitterionic surfactants.

The term “anionic surfactant” means a surfactant comprising, as ionic orionizable groups, only anionic groups. These anionic groups arepreferably chosen from —CO₂H, —CO₂ ⁻, —SO₃H, —SO₃ ⁻, —OSO₃H, —OSO₃ ⁻,—H₂PO₃, —HPO₃ ⁻, —PO₃ ²⁻, —H₂PO₂, ═HPO₂, —HPO₂ ⁻, ═PO₂ ⁻, ═POH and ═PO⁻groups.

Mention may be made, as examples of anionic surfactants that may be usedin the composition according to the invention, of alkyl sulfates, alkylether sulfates, alkylamido ether sulfates, alkylaryl polyether sulfates,monoglyceride sulfates, alkylsulfonates, alkylamidesulfonates,alkylarylsulfonates, α-olefin sulfonates, paraffin sulfonates, alkylsulfosuccinates, alkyl ether sulfosuccinates, alkylamidesulfosuccinates, alkyl sulfoacetates, acylsarcosinates, acylglutamates,alkyl sulfosuccinamates, acylisethionates and N-acyltaurates,polyglycoside polycarboxylic acid and alkyl monoester salts, acyllactylates, salts of D-galactoside uronic acids, salts of alkyl ethercarboxylic acids, salts of alkylaryl ether carboxylic acids, salts ofalkylamido ether carboxylic acids; and the corresponding non-salifiedforms of all these compounds; the alkyl and acyl groups of all thesecompounds comprising from 6 to 24 carbon atoms and the aryl groupdenoting a phenyl group.

These compounds may be oxyethylenated and then preferably comprise from1 to 50 ethylene oxide units.

The salts of C₆-C₂₄ alkyl monoesters of polyglycoside-polycarboxylicacids can be selected from C₆-C₂₄ alkyl polyglycoside-citrates, C₆-C₂₄alkyl polyglycoside-tartrates and C₆-C₂₄ alkylpolyglycoside-sulfosuccinates.

When the anionic surfactant(s) are in salt form, they may be chosen fromalkali metal salts such as the sodium or potassium salt and preferablythe sodium salt, the ammonium salts, the amine salts and in particularamino alcohol salts or the alkaline-earth metal salts such as themagnesium salts.

Examples of amino alcohol salts that may especially be mentioned includemonoethanolamine, diethanolamine and triethanolamine salts,monoisopropanolamine, diisopropanolamine or triisopropanolamine salts,2-amino-2-methyl-1-propanol salts, 2-amino-2-methyl-1,3-propanediolsalts and tris(hydroxy-methyl)-aminomethane salts.

Alkali metal or alkaline-earth metal salts, and in particular sodium ormagnesium salts, are preferably used.

Among the anionic surfactants mentioned, use is preferably made of(C₆-C₂₄)alkyl sulfates, (C₆-C₂₄)alkyl ether sulfates comprising from 2to 50 ethylene oxide units, especially in the form of alkali metal,ammonium, amino alcohol and alkaline-earth metal salts, or a mixture ofthese compounds.

It is particularly preferred to use (C₁₂-C₂₀)alkyl sulfates,(C₁₂-C₂₀)alkyl ether sulfates comprising from 2 to 20 ethylene oxideunits, especially in the form of alkali metal, ammonium, amino alcoholand alkaline-earth metal salts, or a mixture of these compounds. Betterstill, use is made of sodium lauryl ether sulfate containing 2.2 mol ofethylene oxide.

When they are present, the amount of the anionic surfactant(s)preferably ranges from 0.01% to 20% by weight, more preferably from 0.2%to 10% by weight, relative to the total weight of the composition.

The amphoteric or zwitterionic surfactant(s), which are preferablynonsilicone, which can be used in the present invention may especiallybe derivatives of optionally quaternized aliphatic secondary or tertiaryamines, in which derivatives the aliphatic group is a linear or branchedchain comprising from 8 to 22 carbon atoms, said amine derivativescontaining at least one anionic group, for instance a carboxylate,sulfonate, sulfate, phosphate or phosphonate group. Mention may be madein particular of (C₈-C₂₀)alkylbetaines, sulfobetaines,(C₈-C₂₀)alkylamido(C₃-C₈)alkylbetaines and (C₈-C₂₀)alkylamido(C₆-C₈)alkyl sulfobetaines.

Among the optionally quaternized secondary or tertiary aliphatic aminederivatives that can be used, as defined above, mention may also be madeof the compounds of respective structures (A1) and (A2) below:

R_(a)CONHCH₂CH₂N⁺(R_(b))(R_(c))(CH₂COO⁻)  (A1)

in which:

R_(a) represents a C₁₀-C₃₀ alkyl or alkenyl group derived from an acidR_(a)COOH preferably present in hydrolysed coconut oil, or a heptyl,nonyl or undecyl group;

R_(b) represents a β-hydroxyethyl group, and

R_(c) represents a carboxymethyl group;

and

R_(a′)CONHCH₂CH₂N(B)(B′)  (A2)

in which:

B represents the group —CH₂CH₂OX′,

B′ represents the group —(CH₂)_(z)Y′, with z=1 or 2,

X′ represents the group —CH₂COOH, CH₂COOZ′,

—CH₂CH₂COOH, —CH₂CH₂COOZ′, or a hydrogen atom,

Y′ represents the group —COOH, —COOZ′, the group

—CH₂CHOHSO₃H or the group —CH₂CHOHSO₃Z′,

Z′ represents an ion resulting from an alkali metal or alkaline earthmetal, such as sodium, an ammonium ion or an ion resulting from anorganic amine,

R_(a′), represents a C₁₀-C₃₀ alkyl or alkenyl group of an acidR_(a′)COOH preferably present in coconut oil or in hydrolysed linseedoil, an alkyl group, especially of C₁₇ and its iso form, or anunsaturated C₁₇ group.

These compounds are classified in the CTFA dictionary, 5th edition,1993, under the names disodium cocoamphodiacetate, disodiumlauroamphodiacetate, disodium caprylamphodiacetate, disodiumcapryloamphodiacetate, disodium cocoamphodipropionate, disodiumlauroamphodipropionate, disodium caprylamphodipropionate, disodiumcapryloamphodipropionate, lauroamphodipropionic acid andcocoamphodipropionic acid.

By way of example, mention may be made of the cocoamphodiacetate sold bythe company Rhodia under the trade name Miranol® C2M Concentrate.

Among the amphoteric or zwitterionic surfactants mentioned above, use ispreferably made of (C₈-C₂₀)alkylbetaines such as cocoylbetaine, and(C₈-C₂₀)alkylamido(C₃-C₈)alkylbetaines such as cocamidopropylbetaine,and mixtures thereof. More preferentially, the amphoteric orzwitterionic surfactant(s) are chosen from cocamidopropylbetaine andcocoylbetaine.

When they are present, the amount of the amphoteric or zwitterionicsurfactant(s) preferably ranges from 0.01% to 20% by weight and betterstill from 0.2% to 10% by weight, relative to the total weight of thecomposition.

The composition according to the invention may also contain one or moreadditives chosen from alkoxysilanes other than those of formula (I),non-siliceous fatty substances, silicones, solid particles, reducingagents and oxidizing agents.

Other alkoxysilanes, other than those of formula (I), may be used in thecomposition and are preferably compounds of formula (G)_(4-x)Si(OR)_(x),with x denoting an integer ranging from 1 to 3, G denoting identical ordifferent monovalent groups and R denoting a monovalenthydrocarbon-based group comprising one or more carbon atoms andoptionally one or more heteroatoms.

Preferably, the alkoxysilane(s), other than the alkoxysilanes of theinvention, contain two or three alkoxy functions.

Preferably, the alkoxy function(s) are chosen from methoxy and ethoxyfunctions.

According to one particular embodiment, the additional alkoxysilane(s)comprise one or more solubilizing functional groups.

For the purposes of the present invention, the term “solubilizingfunctional group” means any chemical functional group that facilitatesthe dissolution of the alkoxysilane in the medium of the composition,i.e. in the solvent or the solvent mixture of the composition, inparticular in water or in aqueous-alcoholic mixtures.

As solubilizing functional groups that may be used according to thepresent invention, mention may be made of primary, secondary andtertiary amine, aromatic amine, alcohol, carboxylic acid, sulfonic acid,anhydride, carbamate, urea, guanidine, aldehyde, ester, amide, epoxy,pyrrole, gluconamide, pyridyl and polyether groups.

This or these alkoxysilane(s) containing one or more solubilizingfunctional groups may contain one or more silicon atoms.

The alkoxysilane(s) containing one or more solubilizing functionalgroups generally contain two or three alkoxy functions. Preferably, thealkoxy functions are methoxy or ethoxy functions.

According to one particular embodiment, the alkoxysilane(s), other thanthe alkoxysilanes of the invention, are chosen from the compounds offormula (VII) below:

in which:

R₆ represents a halogen or a group OR′ or R′₆,

R₇ represents a halogen or a group OR″ or R′₇,

R₈ represents a halogen or a group OR′″ or R′₈,

R₃, R₄, R₅, R′, R″, R′″, R′₆, R′₇ and R′₈ represent, independently ofeach other, a saturated or unsaturated, linear or branchedhydrocarbon-based group, optionally bearing additional chemical groups,R₃, R₄, R′, R″ and R′″ also possibly denoting hydrogen, at least two ofthe groups R₆, R₇ and R₈ being different from the groups R′₆, R′₇ andR′₈, at least two of the groups R′, R″ and R′″ being other thanhydrogen.

Preferably, the groups R₃, R₄, R′, R′₆, R′₇, R′₈, R″ and R′″ are chosenfrom C₁-C₁₂ alkyl, C₆-C₁₄ aryl, (C₁-C₈)alkyl(C₆-C₁₄)aryl and(C₆-C₁₄)aryl(C₁-C₈)alkyl radicals.

According to one preferred implementation variant of this embodiment,the alkoxysilane(s) comprise a substituent comprising a primary aminefunction, and are chosen from the compounds of formula (VIII) below:

in which the groups R, which may be identical or different, are chosenfrom C₁-C₆ alkyl groups, and n is an integer from 1 to 6 and preferablyfrom 2 to 4.

One alkoxysilane that is particularly preferred according to thisembodiment is γ-aminopropyl triethoxysilane. Such a product is sold, forexample, under the name Z-6011 Silane by the company Dow Corning.

According to another particular embodiment, the alkoxysilane(s), otherthan the alkoxysilanes of the invention, are chosen from the compoundsof formula (IX) below:

in which:

R₁₁ represents a halogen or a group OR′₁₁ and R₁₂ represents a halogenor a group OR′₁₂, at least one of the groups R₁₁ and R₁₂ being otherthan a halogen,

R′₁₁ and R′₁₂ represent, independently of each other, hydrogen or asaturated or unsaturated, linear or branched C₁-C₁₄, hydrocarbon-basedgroup, at least one of the groups R′₁₁ and R′₁₂ being other thanhydrogen,

R₉ is a non-hydrolysable functional group with a cosmetic effect, and

R₁₀ is a non-hydrolysable functional group bearing a function chosenfrom the following functions: amine, carboxylic acid and salts thereof,sulfonic acid and salts thereof, polyalcohols such as glycol, polyethersuch as polyalkene ether, and phosphoric acid and salts thereof.

The term “functional group with a cosmetic effect”, means a group chosenfrom groups derived from a reducing agent, from an oxidizing agent, froma colouring agent, from a polymer, from a surfactant, from anantibacterial agent or from a UV-screening agent.

Examples of groups derived from a colouring agent are, inter alia,nitroaromatic, anthraquinone, naphthoquinone, benzoquinone, azo,xanthene, triarylmethane, azine, indoaniline, indophenol or indoaminegroups. Examples of groups with a reducing effect are, inter alia, thiolor sulfinic acid groups or sulfinic acid salts.

An example of an alkoxy silane of formula (IX) that may be mentioned isaminopropyl-N-(4,2-dinitrophenyl)-amino-propyldiethoxysilane. Suchcompounds are described, for example, in patent application EP 1 216023.

The alkoxysilane(s), other than the alkoxysilanes of the invention, mayalso be chosen from the compounds of formula (X) below:

in which:

R₁₄ represents a halogen or a group OR′₁₄ or R₀,

R₁₅ represents a halogen or a group OR′₁₅ or R′₀,

R₁₆ represents a halogen or a group OR′₁₆ or R″₀, at least two of thegroups R₁₄, R₁₅ and R₁₆ being different from the groups R₀, R′₀ and R″₀,

R₁₃ is a group chosen from groups bearing at least one function chosenfrom the following functions: carboxylic acid and salts thereof,sulfonic acid and salts thereof, polyalkyl ethers.

R₀, R′₀, R″₀, R′₁₄, R′₁₅ and R′₁₆ represent, independently of eachother, a saturated or unsaturated, linear or branched C₁-C₁₄hydrocarbon-based group, optionally bearing additional chemicalfunctions chosen from the following functions: carboxylic acid and saltsthereof, sulfonic acid and salts thereof, polyalkyl ethers, R′₁₄, R′₁₅and R′₁₆ also possibly denoting hydrogen, at least two of the groupsR′₁₄, R′₁₅ and R′₁₆ being other than hydrogen.

Preferably, the groups R′₁₄, R′₁₅ and R′₁₆, R₀, R′₀ and R″₀ represent aC₁-C₁₂ alkyl, C₆-C₁₄ aryl, (C₁-C₈)alkyl(C₆-C₁₄)aryl or(C₆-C₁₄)aryl(C₁-C₈)alkyl group.

According to another embodiment, the alkoxysilane(s), other than thealkoxysilanes of the invention, are chosen from the compounds of formula(XI) below:

(R₂₁O)_(x)(R₂₂)_(y)Si(B)_(p)[NR₂₃(B′)_(p′)]_(q)[NR′₂₃(B″)_(p″)]_(q′)Si(R′₂₂)_(y′)(OR′₂₁)_(x′)  (XI)

in which:

R₂₁, R₂₂, R′₂₁ and R′₂₂ each independently represent a saturated orunsaturated, linear or branched hydrocarbon-based chain, optionallycontaining one or more heteroatoms, optionally interrupted orsubstituted with one or more groups chosen from ether, ester, amine,amide, carboxyl, hydroxyl and carbonyl groups,

x is an integer ranging from 1 to 3, y=3−x, x′ is an integer rangingfrom 1 to 3, y′=3−x′, p=0 or 1, p′=0 or 1, p″=0 or 1, q=0 or 1, q′=0 or1, it being understood that at least q or q′ is other than zero,

B, B′ and B″ each independently represent a linear or branched divalentC₁-C₂₀ alkylene radical,

R₂₃ and R′₂₃ each independently represent a hydrogen atom or a saturatedor unsaturated, linear or branched hydrocarbon-based chain, optionallycontaining one or more heteroatoms, optionally interrupted orsubstituted with one or more ether, C₁-C₂₀ alcohol ester, amine,carboxyl, C₆-C₃₀ aryl, hydroxyl or carbonyl groups, or a heterocyclic ornon-heterocyclic aromatic ring, optionally substituted with one or moreC₃-C₂₀ alcohol ester, amine, amide, carboxyl, hydroxyl, carbonyl or acylgroups,

As explained previously, R₂₁, R₂₂, R′₂₁ and R′₂₂ each independentlyrepresent a hydrocarbon-based chain. The term “hydrocarbon-based chain”preferably means a chain comprising from 1 to 10 carbon atoms.

Similarly, R₂₃ and R′₂₃ may represent a hydrocarbon-based chain. In thiscase, a chain comprising from 1 to 10 carbon atoms is preferablyintended.

Preferably, the aromatic ring comprises from 6 to 30 carbon atoms. Evenmore preferentially, it denotes an optionally substituted phenylradical.

Preferably, R₂₁=R′₂₁, R₂₂=R′₂₂, x=y=y′, p=p′, A=A′, q=1 and q′=0.

The alkoxysilane(s) of formula (XI) may also have the followingcharacteristics, taken alone or in combination:

-   -   R₂₁, R₂₂, R′₂₁ and R′₂₂, which may be identical or different,        represent a C₁-C₄ alkyl,    -   p=p′=1,

B and B′, which may be identical or different, represent a linear C₁-C₄alkylene and

-   -   R₂₃ is hydrogen.

According to another embodiment of the invention, the alkoxysilane(s),other than the alkoxysilanes of the invention, are chosen from thecompounds of formula (XII) below:

in which:

R₂₄ and R₂₅ each independently represent a saturated or unsaturated,linear or branched hydrocarbon-based chain, optionally containing one ormore heteroatoms, optionally interrupted or substituted with one or moregroups chosen from ether, ester, amine, amide, carboxyl, hydroxyl andcarbonyl groups,

x″=2 or 3,

y″=3-x″,

n′=0 or 1,

n″=0 or 1,

E and E′ each independently represent a linear or branched divalentC₁-C₂₀ alkylene group,

R₂₆ and R₂₇ each independently represent a hydrogen atom or a saturatedor unsaturated, linear or branched hydrocarbon-based chain, optionallycontaining one or more heteroatoms, optionally interrupted orsubstituted with one or more ether, C₁-C₂₀ alcohol ester, amine,carboxyl, C₆-C₃₀ aryl, hydroxyl or carbonyl groups, or a heterocyclic ornon-heterocyclic aromatic ring, optionally substituted with one or moreC₁-C₂₀ alcohol ester, amine, amide, carboxyl, hydroxyl, carbonyl or acylgroups,

r is an integer ranging from 0 to 4,

r′=0 or 1,

the group(s) R₂₈ each independently represent a hydrogen atom or asaturated or unsaturated, linear or branched preferably C₁-C₁₀hydrocarbon-based chain, optionally containing one or more heteroatoms,optionally interrupted or substituted with one or more ether, C₁-C₂₀alcohol ester, amine, carboxyl, C₆-C₃₀ aryl, hydroxyl or carbonylgroups, or a heterocyclic or non-heterocyclic aromatic ring, optionallysubstituted with one or more C₁-C₂₀ alcohol ester, amine, amide,carboxyl, hydroxyl, carbonyl or acyl groups.

As explained previously, R₂₄ and R₂₅ each independently represent ahydrocarbon-based chain. The term “hydrocarbon-based chain” preferablymeans a chain comprising from 1 to 10 carbon atoms.

Similarly, R₂₆ and R₂₇ may represent a hydrocarbon-based chain. In thiscase, a chain comprising from 1 to 10 carbon atoms is preferablyintended.

Preferably, the aromatic ring comprises from 6 to 30 carbon atoms. Evenmore preferentially, it denotes an optionally substituted phenyl group.

The alkoxysilane(s) of formula (XII) may have the followingcharacteristics, taken alone or in combination:

-   -   R₂₄ is a C₁-C₄ alkyl,    -   x″=3, n′=n″=1; r=r′=0,

R₂₆ and R₂₇ independently represent hydrogen or a group chosen fromC₁-C₄ alkyl, C₁-C₄ hydroxyalkyl and C₁-C₄ aminoalkyl groups.

In particular, the alkoxysilane(s) of formula (XII) may be chosen from:

-   -   3-(m-aminophenoxy)propyltrimethoxysilane, of formula:

-   -   p-aminophenyltrimethoxysilane, of formula:

-   -   N-(2-aminoethylaminomethyl)phenethyltrimethoxysilane, of        formula:

The alkoxysilane(s), other than those of formula (I), may also be chosenfrom the compounds of formula (XIII) below:

(R₂₉O)_(x1)(R₃₀)_(y1)Si(A₁)_(s)CH═O  (XIII)

in which:

R₂₉ and R₃₀ each independently represent a saturated or unsaturated,linear or branched hydrocarbon-based chain, optionally containing one ormore heteroatoms, optionally interrupted or substituted with one or moregroups chosen from ether, ester, amine, amide, carboxyl, hydroxyl andcarbonyl groups,

x₁=2 or 3, y₁=3−x₁,

A₁ represents a linear or branched C₁-C₂₀ divalent alkylene group,optionally interrupted or substituted with one or more C₁-C₃₀ alcoholester, amine, carboxyl, alkoxysilane, C₆-C₃₀ aryl, hydroxyl or carbonylgroups,

s=0 or 1,

As explained previously, R₂₉ and R₃₀ each independently represent ahydrocarbon-based chain. The term “hydrocarbon-based chain” preferablymeans a chain comprising from 1 to 10 carbon atoms.

The alkoxysilane(s) of formula (XIII) may also have the followingcharacteristics, taken alone or in combination:

R₂₉ and R₃₀ are chosen from C₁-C₄ alkyls,

s=1,

A₁ is a linear C₁-C₄ alkylene,

In particular, the alkoxysilane(s) of formula (XIII) may be chosen from:

-   -   triethoxysilylbutyraldehyde, of formula:

(CH₃CH₂O)₃Si(CH₂)₃CH═O

-   -   triethoxysilylundecanal, of formula:

(CH₃CH₂O)₃Si(CH₂)₁₀CH═O and

-   -   triethoxysilylundecanal ethylene glycol acetal, of formula:

(CH₃CH₂O)₃Si(CH₂)₁₀CH(OCH₂)₂.

The preferred compound of formula (XIII) is triethoxysilylbutyraldehyde.Such a product is sold, for example, under the name SIT 8185.3 by thecompany Gelest.

According to one particularly preferred embodiment of the invention, thealkoxysilane(s), other than the alkoxysilanes of the invention, arechosen from the di- and/or trialkoxysilanes bearing one or moresubstituents comprising one or more amine functions.

According to an even more preferred embodiment, the alkoxysilane(s),other than the alkoxysilanes of the invention, are chosen fromtrialkoxysilanes bearing a substituent comprising one or more aminefunctions, more particularly from the compounds of formula (VIII).

An additional alkoxysilane that is most particularly preferred isγ-aminopropyltriethoxysilane cited previously.

The alkoxysilane(s), other than the alkoxysilanes of the invention, maybe present in the compositions according to the invention in proportionspreferably ranging from 0.01% to 25% by weight, more preferentially from0.05% to 20% by weight and more particularly from 0.1% to 15% by weightrelative to the total weight of the composition.

The composition according to the invention may also comprise one or morenon-siliceous fatty substances.

The term “fatty substance” means an organic compound that is insolublein water at standard temperature (25° C.) and at atmospheric pressure(760 mmHg, i.e. 1.013×10⁵ Pa), i.e. with a solubility of less than 5%,preferably of less than 1% and even more preferably of less than 0.1%.The non-siliceous fatty substances generally have in their structure ahydrocarbon-based chain comprising at least 6 carbon atoms and notcomprising any siloxane groups. In addition, the fatty substances aregenerally soluble in organic solvents under the same temperature andpressure conditions, for instance chloroform, ethanol, benzene, liquidpetroleum jelly or decamethylcyclopentasiloxane.

The term “non-siliceous fatty substance” means a fatty substance whosestructure does not comprise any silicon atoms.

The fatty substances that may be used in the composition according tothe invention are generally not oxyalkylenated and preferably do notcontain any carboxylic acid COOH functions.

Preferably, the non-siliceous fatty substances are chosen fromhydrocarbons, fatty alcohols, fatty esters, silicones and fatty ethers,and mixtures thereof.

Even more preferentially, they are chosen from hydrocarbons, fattyalcohols, fatty esters and ceramides, and mixtures thereof.

They may be liquid or non-liquid, at room temperature and at atmosphericpressure.

The liquid fatty substances of the invention preferably have a viscosityof less than or equal to 2 Pa·s, better still less than or equal to 1Pa·s and even better still less than or equal to 0.1 Pa·s at atemperature of 25° C. and at a shear rate of 1 s⁻¹.

The term “liquid hydrocarbon” means a hydrocarbon composed solely ofcarbon and hydrogen atoms, which is liquid at standard temperature (25°C.) and at atmospheric pressure (760 mmHg, i.e. 1.013×10⁵ Pa), which isespecially of mineral or plant origin, preferably of plant origin.

More particularly, the liquid hydrocarbons are chosen from:

-   -   linear or branched, optionally cyclic, C₆-C₁₆ alkanes. Examples        that may be mentioned include hexane, undecane, dodecane,        tridecane, and isoparaffins, for instance isohexadecane,        isododecane and isodecane,    -   linear or branched hydrocarbons of mineral, animal or synthetic        origin with more than 16 carbon atoms, such as volatile or        non-volatile liquid paraffins, petroleum jelly, liquid petroleum        jelly, polydecenes, hydrogenated polyisobutene such as the        product sold under the brand name Parleam® by the company NOF        Corporation, and squalane.

In one preferred variant, the liquid hydrocarbon(s) are chosen fromvolatile or non-volatile liquid paraffins, and liquid petroleum jelly.

The term “liquid fatty alcohol” means a non-glycerolated andnon-oxyalkylenated fatty alcohol, which is liquid at standardtemperature (25° C.) and at atmospheric pressure (760 mmHg, i.e.1.013×10⁵ Pa).

Preferably, the liquid fatty alcohols of the invention comprise from 8to 50 carbon atoms.

The liquid fatty alcohols of the invention may be saturated orunsaturated.

The saturated liquid fatty alcohols are preferably branched. They mayoptionally comprise in their structure at least one aromatic ornon-aromatic ring. They are preferably acyclic.

More particularly, the liquid saturated fatty alcohols of the inventionare chosen from octyldodecanol, isostearyl alcohol and 2-hexyldecanol.

Octyldodecanol is most particularly preferred.

The unsaturated liquid fatty alcohols contain in their structure atleast one double or triple bond, and preferably one or more doublebonds. When several double bonds are present, there are preferably 2 or3 of them, and they may be conjugated or unconjugated.

These unsaturated fatty alcohols may be linear or branched.

They may optionally comprise in their structure at least one aromatic ornon-aromatic ring. They are preferably acyclic.

More particularly, the unsaturated liquid fatty alcohols of theinvention are chosen from oleyl alcohol, linoleyl alcohol, linolenylalcohol and undecylenyl alcohol.

Oleyl alcohol is most particularly preferred.

The term “liquid fatty esters” means an ester derived from a fatty acidand/or from a fatty alcohol that is liquid at standard temperature (25°C.) and at atmospheric pressure (760 mmHg, i.e. 1.013×10⁵ Pa).

The esters are preferably liquid esters of saturated or unsaturated,linear or branched C₁-C₂₆ aliphatic monoacids or polyacids and ofsaturated or unsaturated, linear or branched C₁-C₂₆ aliphaticmonoalcohols or polyalcohols, the total number of carbon atoms of theesters being greater than or equal to 10.

Preferably, for the esters of monoalcohols, at least one from among thealcohol and the acid from which the esters of the invention are derivedis branched.

Among the monoesters of monoacids and of monoalcohols, mention may bemade of ethyl palmitate, isopropyl palmitate, alkyl myristates such asisopropyl myristate or ethyl myristate, isocetyl stearate, 2-ethylhexylisononanoate, isodecyl neopentanoate, isostearyl neopentanoate andisononyl isononanoate.

Esters of C₄-C₂₂ dicarboxylic or tricarboxylic acids and of C₁-C₂₂alcohols and esters of monocarboxylic, dicarboxylic or tricarboxylicacids and of C₄-C₂₆ dihydroxy, trihydroxy, tetrahydroxy or pentahydroxyalcohols may also be used.

Mention may be made especially of: diethyl sebacate; diisopropylsebacate; bis(2-ethylhexyl) sebacate; diisopropyl adipate; di-n-propyladipate; dioctyl adipate; bis(2-ethylhexyl) adipate; diisostearyladipate; bis(2-ethylhexyl) maleate; triisopropyl citrate; triisocetylcitrate; triisostearyl citrate; glyceryl trilactate; glyceryltrioctanoate; trioctyldodecyl citrate; trioleyl citrate; neopentylglycol diheptanoate; diethylene glycol diisononanoate.

The composition may also comprise, as liquid fatty ester, sugar estersand diesters of C₆-C₃₀ and preferably C₁₂-C₂₂ fatty acids. It isrecalled that the term “sugar” means oxygen-bearing hydrocarbon-basedcompounds containing several alcohol functions, with or without aldehydeor ketone functions, and which comprise at least 4 carbon atoms. Thesesugars may be monosaccharides, oligosaccharides or polysaccharides.

Examples of suitable sugars that may be mentioned include saccharose,glucose, galactose, ribose, fucose, maltose, fructose, mannose,arabinose, xylose and lactose, and derivatives thereof, especially alkylderivatives, such as methyl derivatives, for instance methylglucose.

The sugar esters of fatty acids may be chosen especially from the groupcomprising the esters or mixtures of esters of sugars describedpreviously and of linear or branched, saturated or unsaturated C₆-C₃₀and preferably C₁₂-C₂₂ fatty acids. If they are unsaturated, thesecompounds may comprise one to three conjugated or unconjugatedcarbon-carbon double bonds.

The esters according to this variant may also be chosen from mono-, di-,tri- and tetraesters, and polyesters, and mixtures thereof.

These esters may be chosen, for example, from oleates, laurates,palmitates, myristates, behenates, cocoates, stearates, linoleates,linolenates, caprates and arachidonates, or mixtures thereof, such as,in particular, oleopalmitate, oleostearate or palmitostearate mixedesters.

More particularly, use is made of monoesters and diesters and inparticular of sucrose, glucose or methylglucose mono- or dioleates,stearates, behenates, oleopalmitates, linoleates, linolenates oroleostearates.

An example that may be mentioned is the product sold under the nameGlucate® DO by the company Amerchol, which is a methylglucose dioleate.

Finally, use may also be made of natural or synthetic glycerol esters ofmono-, di- or triacids.

Among these, mention may be made of plant oils.

As oils of plant origin or synthetic triglycerides that may be used inthe composition of the invention as liquid fatty esters, examples thatmay be mentioned include:

-   -   triglyceride oils of plant or synthetic origin, such as liquid        fatty acid triglycerides containing from 6 to 30 carbon atoms,        for instance heptanoic or octanoic acid triglycerides, or        alternatively, for example, sunflower oil, corn oil, soybean        oil, marrow oil, grapeseed oil, sesame seed oil, hazelnut oil,        apricot oil, macadamia oil, arara oil, castor oil, avocado oil,        olive oil, rapeseed oil, coconut oil, wheatgerm oil, sweet        almond oil, apricot oil, safflower oil, candlenut oil, camellina        oil, tamanu oil, babassu oil and pracaxi oil, caprylic/capric        acid triglycerides, for instance those sold by the company        Stéarineries Dubois or those sold under the names Miglyol® 810,        812 and 818 by the company Dynamit Nobel, jojoba oil and shea        butter oil.

Liquid fatty esters derived from monoalcohols will preferably be used asesters according to the invention.

Isopropyl myristate and isopropyl palmitate are particularly preferred.

The liquid fatty ethers are chosen from liquid dialkyl ethers such asdicaprylyl ether.

The fatty substances of the invention may be liquid or non-liquid atroom temperature (25° C.) and at atmospheric pressure (760 mmHg, i.e.1.013×10⁵ Pa).

The term “non-liquid” preferably means a solid compound or a compoundthat has a viscosity of greater than 2 Pa·s at a temperature of 25° C.and at a shear rate of 1 s⁻¹.

More particularly, the non-liquid fatty substances are chosen from fattyalcohols, fatty acid and/or fatty alcohol esters, non-siliceous waxesand fatty ethers, which are non-liquid and preferably solid.

The non-liquid fatty alcohols that are suitable for use in the inventionare more particularly chosen from saturated or unsaturated, linear orbranched alcohols comprising from 8 to 30 carbon atoms.

Mention may be made, for example, of cetyl alcohol, stearyl alcohol anda mixture thereof (cetylstearyl alcohol).

As regards the non-liquid esters of fatty acids and/or of fattyalcohols, mention may be made especially of solid esters derived fromC₉-C₂₆ fatty acids and from C₉-C₂₆ fatty alcohols.

Among these esters, mention may be made of octyldodecyl behenate,isocetyl behenate, cetyl lactate, stearyl octanoate, octyl octanoate,cetyl octanoate, decyl oleate, myristyl stearate, octyl palmitate, octylpelargonate, octyl stearate, alkyl myristates such as cetyl myristate,myristyl myristate and stearyl myristate, and hexyl stearate.

Still within the context of this variant, esters of C₄-C₂₂ dicarboxylicor tricarboxylic acids and of C₁-C₂₂ alcohols and esters ofmonocarboxylic, dicarboxylic or tricarboxylic acids and of C₂-C₂₆dihydroxy, trihydroxy, tetrahydroxy or pentahydroxy alcohols may also beused.

Mention may be made especially of diethyl sebacate, diisopropylsebacate, diisopropyl adipate, di-n-propyl adipate, dioctyl adipate anddioctyl maleate.

Among all the esters mentioned above, it is preferred to use myristyl,cetyl or stearyl palmitates, and alkyl myristates such as cetylmyristate, stearyl myristate and myristyl myristate.

The non-siliceous wax(es) are chosen especially from carnauba wax,candelilla wax, esparto wax, paraffin wax, ozokerite, plant waxes, suchas olive tree wax, rice wax, hydrogenated jojoba wax or absolute flowerwaxes, such as the blackcurrant blossom essential wax sold by Bertin(France), or animal waxes, such as beeswaxes or modified beeswaxes(cerabellina), and ceramides.

The ceramides or ceramide analogues, such as glycoceramides, that may beused in the compositions according to the invention are known per se andare natural or synthetic molecules that may correspond to the generalformula (XIV) below:

in which:

-   -   R₁ denotes a linear or branched, saturated or unsaturated alkyl        group, derived from C₁₄-C₃₀ fatty acids, it being possible for        this group to be substituted with a hydroxyl group in the alpha        position, or a hydroxyl group in the omega position esterified        with a saturated or unsaturated C₁₆-C₃₀ fatty acid,    -   R₂ denotes a hydrogen atom or a (glycosyl)_(n), (galactosyl)_(m)        or sulfogalactosyl group, in which n is an integer ranging from        1 to 4 and m is an integer ranging from 1 to 8,    -   R₃ denotes a C₁₅-C₂₆ hydrocarbon-based group which is saturated        or unsaturated in the alpha position, it being possible for this        group to be substituted with one or more C₁-C₁₄ alkyl groups;

it being understood that, in the case of natural ceramides orglycoceramides, R₃ can also denote a C₁₅-C₂₆ α-hydroxyalkyl group, thehydroxyl group being optionally esterified with a C₁₆-C₃₀ α-hydroxyacid.

The ceramides that are preferred in the context of the present inventionare those described by Downing in Arch. Dermatol., Vol. 123, 1381-1384,1987, or those described in French patent FR 2 673 179.

The ceramide(s) that are more particularly preferred according to theinvention are the compounds for which R₁ denotes a saturated orunsaturated alkyl derived from C₁₆-C₂₂ fatty acids; R₂ denotes ahydrogen atom; and R₃ denotes a saturated linear C₁₅ group.

Such compounds are, for example, N-linoleyl-dihydrosphingosine,N-oleyl-dihydrosphingosine, N-palmityl-dihydrosphingosine,N-stearyl-dihydrosphingosine or N-behenyl-dihydrosphingosine, ormixtures of these compounds.

Even more preferentially, use is made of ceramides for which R₁ denotesa saturated or unsaturated alkyl group derived from fatty acids, R₂denotes a galactosyl or sulfogalactosyl group and R₃ denotes a—CH═CH—(CH₂)₁₂—CH₃ group.

Other waxes or waxy starting materials that may be used according to theinvention are especially marine waxes such as those sold by the companySophim under the reference M82, and waxes of polyethylene or ofpolyolefins in general.

The non-liquid fatty ethers are chosen from dialkyl ethers andespecially dicetyl ether and distearyl ether, alone or as a mixture.

Preferably, the non-siliceous fatty substances according to theinvention are chosen from hydrocarbons, fatty alcohols, fatty esters andceramides.

Even more preferably, the non-siliceous fatty substances are chosen fromliquid petroleum jelly, stearyl alcohol, cetyl alcohol and a mixturethereof such as cetylstearyl alcohol, octyldodecanol, oleyl alcohol,isopropyl palmitate, isopropyl myristate, N-oleyldihydrosphingosine,N-behenyldihydrosphingosine and N-linoleyldihydrosphingosine.

The non-siliceous fatty substance(s) may be present in an amount rangingfrom 0.01% to 40% by weight and especially from 0.1% to 5% by weightrelative to the total weight of the composition.

The composition according to the invention may also comprise one or moresilicones.

The silicones that may be used in the composition according to theinvention are in particular polyorganosiloxanes that may be in the formof aqueous solutions, i.e. dissolved, or optionally in the form ofdispersions or microdispersions, or of aqueous emulsions. Thepolyorganosiloxanes may also be in the form of oils, waxes, resins orgums.

Organopolysiloxanes are defined in greater detail in Walter Noll'sChemistry and Technology of Silicones (1968), Academic Press.

The silicones may be volatile or non-volatile.

When they are volatile, the silicones are more particularly chosen fromthose with a boiling point of between 60° C. and 260° C., and even moreparticularly from:

(i) cyclic silicones comprising from 3 to 7 and preferably 4 to 5silicon atoms.

These are, for example, octamethylcyclotetrasiloxane sold especiallyunder the name Volatile Silicone 7207 by the company Union Carbide orSilbione 70045 V 2 by the company Rhodia, decamethylcyclopentasiloxanesold under the name Volatile Silicone 7158 by the company Union Carbide,and Silbione 70045 V 5 by the company Rhodia, and mixtures thereof.

Mention may also be made of cyclocopolymers of thedimethylsiloxane/methylalkylsiloxane type, such as Volatile Silicone FZ3109 sold by the company Union Carbide, of chemical structure:

Mention may also be made of mixtures of cyclic silicones withorganosilicon compounds, such as the mixture ofoctamethyl-cyclotetrasiloxane andtetrakis(trimethylsilyl)-pentaerythritol (50/50) and the mixture ofoctamethylcyclo-tetrasiloxane andoxy-1,1′-bis(2,2,2′,2′,3,3′-hexatrimethyl-silyloxy)neopentane;

(ii) linear volatile silicones containing 2 to 9 silicon atoms andhaving a viscosity of less than or equal to 5×10⁻⁶ m²/s at 25° C. Anexample is decamethyltetrasiloxane sold in particular under the name SH200 by the company Toray Silicone. Silicones belonging to this categoryare also described in the article published in Cosmetics and Toiletries,Vol. 91, Jan. 76, pp. 27-32, Todd & Byers, Volatile Silicone Fluids forCosmetics.

When the silicones are non-volatile, use is preferably made ofpolyalkylsiloxanes, polyarylsiloxanes, polyalkylarylsiloxanes, siliconegums and resins, and polyorganosiloxanes modified with organofunctionalgroups, and mixtures thereof.

These silicones are more particularly chosen from polyalkylsiloxanes,among which mention may be made mainly of polydimethylsiloxanescontaining trimethylsilyl end groups (Dimethicone according to the CTFAname) having a viscosity of from 5×10⁻⁶ to 2.5 m²/s at 25° C. andpreferably 1×10⁻⁵ to 1 m²/s. The viscosity of the silicones is measured,for example, at 25° C. according to standard ASTM 445 Appendix C.

Among these polyalkylsiloxanes, mention may be made, in a non-limitingmanner, of the following commercial products:

-   -   the Silbione oils of the 47 and 70 047 series or the Mirasil        oils sold by the company Rhodia, for instance the oil 70 047 V        500 000,    -   the oils of the Mirasil series sold by the company Rhodia,    -   the oils of the 200 series from the company Dow Corning, such        as, more particularly, DC200 with a viscosity of 60 000 cSt,    -   the Viscasil oils from the company General Electric and certain        oils of the SF series (SF 96, SF 18) from the company General        Electric.

Mention may also be made of polydimethylsiloxanes containingdimethylsilanol end groups (Dimethiconol according to the CTFA name)such as the oils of the 48 series from the company Rhodia.

Mention may also be made of polydimethylsiloxanes containing aminoethyl,aminopropyl and α,ω-silanol groups.

In this category of polyalkylsiloxanes, mention may also be made of theproducts sold under the names Abil Wax 9800 and 9801 by the companyGoldschmidt, which are poly(C₁-C₂₀)alkylsiloxanes.

The polyalkylarylsiloxanes are particularly chosen from linear and/orbranched polydimethylmethylphenylsiloxanes andpolydimethyldiphenylsiloxanes with a viscosity of from 1×10⁻⁵ to 5×10⁻²m²/s at 25° C.

Among these polyalkylarylsiloxanes, examples that may be mentionedinclude the products sold under the following names:

-   -   Silbione oils of the 70 641 series from the company Rhodia,    -   the oils of the Rhodorsil 70 633 and 763 series from the company        Rhodia,    -   the oil Dow Corning 556 Cosmetic Grade Fluid from the company        Dow Corning,    -   silicones of the PK series from the company Bayer, such as the        product PK20,    -   the silicones of the PN and PH series from the company Bayer,        such as the products PN1000 and PH1000,    -   certain oils of the SF series from the company General Electric,        such as SF 1023, SF 1154, SF 1250 and SF 1265.

The silicone gums that may be present in the composition according tothe invention are especially polydiorganosiloxanes having highnumber-average molecular masses of between 200 000 and 1 000 000, usedalone or as a mixture in a solvent. This solvent can be chosen fromvolatile silicones, polydimethylsiloxane (PDMS) oils,polyphenylmethylsiloxane (PPMS) oils, isoparaffins, polyisobutylenes,methylene chloride, pentane, dodecane and tridecane, or mixturesthereof.

Mention may be made more particularly of the following products:

-   -   polydimethylsiloxane gums,    -   polydimethylsiloxane/methylvinylsiloxane gums,    -   polydimethylsiloxane/diphenylsiloxane gums,    -   polydimethylsiloxane/phenylmethylsiloxane gums,        -   polydimethylsiloxane/diphenylsiloxane/methylvinylsiloxane            gums.

Products that may be used more particularly are the following mixtures:

-   -   mixtures formed from a polydimethylsiloxane hydroxylated at the        end of the chain (known as dimethiconol according to the        nomenclature of the CTFA dictionary) and from a cyclic        polydimethylsiloxane (known as cyclomethicone according to the        nomenclature of the CTFA dictionary), such as the product Q2        1401 sold by the company Dow Corning,    -   mixtures formed from a polydimethylsiloxane gum with a cyclic        silicone, such as the product SF 1214 Silicone Fluid from the        company General Electric, this product being an SF 30 gum        corresponding to a dimethicone, having a number-average        molecular weight of 500 000, dissolved in the oil SF 1202        Silicone Fluid corresponding to decamethylcyclopentasiloxane,    -   mixtures of two PDMSs with different viscosities, and more        particularly of a PDMS gum and a PDMS oil, such as the product        SF 1236 from the company General Electric. The product SF 1236        is a mixture of a gum SE 30 defined above, with a viscosity of        20 m²/s and of an oil SF 96 with a viscosity of 5×10⁻⁶ m²/s.        This product preferably comprises 15% of gum SE 30 and 85% of an        oil SF 96.

The organopolysiloxane resins that may be present in the compositionaccording to the invention are crosslinked siloxane systems containingthe following units: R₂SiO_(2/2), R₃SiO_(1/2), RSiO_(3/2) and SiO_(4/2)in which R represents a hydrocarbon group containing 1 to 16 carbonatoms or a phenyl group. Among these products, the ones that areparticularly preferred are those in which R denotes a C₁-C₄ alkyl group,more particularly methyl, or a phenyl group.

Among these resins, mention may be made of the product sold under thename Dow Corning 593 or those sold under the names Silicone Fluid SS4230 and SS 4267 by the company General Electric, which are silicones ofdimethyl/trimethylsiloxane structure.

Mention may also be made of the trimethyl siloxysilicate type resinssold in particular under the names X22-4914, X21-5034 and X21-5037 bythe company Shin-Etsu.

The organomodified silicones that may be present in the compositionaccording to the invention are silicones as defined above and comprisingin their structure one or more organofunctional groups attached via ahydrocarbon-based group.

Among the organomodified silicones, mention may be made ofpolyorganosiloxanes comprising:

-   -   polyethyleneoxy and/or polypropyleneoxy groups optionally        comprising C₆-C₂₄ alkyl groups, such as the products known as        dimethicone copolyol sold by the company Dow Corning under the        name DC 1248 or the oils Silwet L 722, L 7500, L 77 and L 711 by        the company Union Carbide, and the (C₁₂)alkylmethicone copolyol        sold by the company Dow Corning under the name Q2 5200,    -   thiol groups, such as the products sold under the names GP 72 A        and GP 71 from the company Genesee,    -   alkoxylated groups, such as the product sold under the name        Silicone Copolymer F755 by SWS Silicones and Abil Wax 2428, 2434        and 2440 by the company Goldschmidt,    -   hydroxylated groups, such as the polyorganosiloxanes containing        a hydroxyalkyl function, described in French patent application        FR-A-85/2,589,476,    -   acyloxyalkyl groups, for instance the polyorganosiloxanes        described in U.S. Pat. No. 4,957,732,    -   anionic groups of the carboxylic acid type, for instance in the        products described in patent EP 186 507 from the company Chisso        Corporation, or of the alkylcarboxylic type, such as those        present in the product X-22-3701E from the company Shin-Etsu;        2-hydroxyalkyl sulfonate; 2-hydroxyalkyl thiosulfate such as the        products sold by the company Goldschmidt under the names Abil        S201 and Abil S255,    -   hydroxyacylamino groups, for instance the polyorganosiloxanes        described in patent application EP 342 834. Mention may be made,        for example, of the product Q2-8413 from the company Dow        Corning.

Among the organomodified silicones, mention may also be made of aminosilicones.

For the purposes of the present invention, the term “amino silicone”means any silicone comprising at least one primary, secondary ortertiary amine function or a quaternary ammonium group.

The amino silicones that may be used in the cosmetic compositionaccording to the present invention are chosen from:

(a) the compounds corresponding to formula (XV) below:

(R₁)_(a)(T)_(3-a)Si[OSi(T)₂]_(n)[OSi(T)_(b)(R₁)_(2-b)]_(m)OSi(T)_(3-a)(R₁)_(a)  (XV)

in which:

T is a hydrogen atom or a phenyl, hydroxyl (—OH) or C₁-C₈ alkyl group,and preferably methyl, or a C₁-C₈ alkoxy, preferably methoxy,

a denotes the number 0 or an integer from 1 to 3, and preferably 0,

b denotes 0 or 1, and in particular 1,

m and n are numbers such that the sum (n+m) can range especially from 1to 2000 and in particular from 50 to 150, it being possible for n todenote a number from 0 to 1999 and in particular from 49 to 149, and form to denote a number from 1 to 2000 and in particular from 1 to 10,

R¹ is a monovalent group of formula —C_(q)H_(2q)L in which q is a numberfrom 2 to 8 and L is an optionally quaternized amino group chosen fromthe following groups:

—N(R₂)—CH₂—CH₂—N(R²)₂;

—N(R²)₂,

—N⁺(R²)₃Q⁻,

—N⁺(R²)(H)₂Q⁻,

—N⁺(R²)₂HQ⁻,

—N(R²)—CH₂—CH₂—N⁺(R²)(H)₂Q⁻,

in which R² may denote a hydrogen atom, a phenyl, a benzyl or asaturated monovalent hydrocarbon-based group, for example a C₁-C₂₀ alkylgroup, and Q⁻ represents a halide ion, for instance fluoride, chloride,bromide or iodide.

In particular, the amino silicones corresponding to the definition offormula (XV) are chosen from the compounds corresponding to formula(XVI) below:

in which R, R′ and R″, which may be identical or different, denote aC₁-C₄ alkyl group, preferably CH₃; a C₁-C₄ alkoxy group, preferablymethoxy; or OH; A represents a linear or branched, C₃-C₈ and preferablyC₃-C₆ alkylene group; m and n are integers dependent on the molecularweight and whose sum is between 1 and 2000.

According to a first possibility, R, R′ and R″, which may be identicalor different, represent a C₁-C₄ alkyl or hydroxyl group, A represents aC₃ alkylene group and m and n are such that the weight-average molecularmass of the compound is between 5000 and 500 000 approximately.Compounds of this type are referred to in the CTFA dictionary as“amodimethicones”.

According to a second possibility, R, R′ and R″, which may be identicalor different, each represent a C₁-C₄ alkoxy or hydroxyl group, at leastone of the groups R or R″ is an alkoxy group and A represents a C₃alkylene group. The hydroxy/alkoxy mole ratio is preferably between0.2/1 and 0.4/1 and advantageously equal to 0.3/1. Moreover, m and n aresuch that the weight-average molecular mass of the compound is between2000 and 10⁶. More particularly, n is between 0 and 999 and m is between1 and 1000, the sum of n and m being between 1 and 1000.

In this category of compounds, mention may be made, inter alia, of theproduct Belsil® ADM 652 sold by the company Wacker.

According to a third possibility, R and R″, which are different, eachrepresent a C₁-C₄ alkoxy or hydroxyl group, at least one of the groups Ror R″ being an alkoxy group, R′ representing a methyl group and Arepresenting a C₃ alkylene group. The hydroxy/alkoxy mole ratio ispreferably between 1/0.8 and 1/1.1 and advantageously equal to 1/0.95.Moreover, m and n are such that the weight-average molecular mass of thecompound is between 2000 and 200 000. More particularly, n is between 0and 999 and m is between 1 and 1000, the sum of n and m being between 1and 1000.

More particularly, mention may be made of the product Fluid WR® 1300sold by the company Wacker.

Note that the molecular mass of these silicones is determined by gelpermeation chromatography (ambient temperature, polystyrene standard; μstyragem columns; eluent THF; flow rate 1 mm/minute; 200 μl of asolution containing 0.5% by weight of silicone in THF are injected, anddetection is performed by refractometry and UV-metry).

A product corresponding to the definition of formula (XV) is inparticular the polymer known in the CTFA dictionary as TrimethylsilylAmodimethicone, corresponding to formula (XVII) below:

in which n and m have the meanings given above in accordance withformula (XV).

Such compounds are described, for example, in patent EP 95238. Acompound of formula (XVII) is sold, for example, under the name Q2-8220by the company OSI.

(b) the compounds corresponding to formula (XVIII) below:

in which:

R³ represents a C₁-C₁₈ monovalent hydrocarbon-based group, and inparticular a C₁-C₁₈ alkyl or C₂-C₁₈ alkenyl group, for example methyl,

R⁴ represents a divalent hydrocarbon-based group, especially a C₁-C₁₈alkylene group or a divalent C₁-C₁₈, and for example C₁-C₈, alkylenoxygroup,

Q⁻ is a halide ion, in particular chloride;

r represents a mean statistical value from 2 to 20 and in particularfrom 2 to 8,

s represents a mean statistical value from 20 to 200 and in particularfrom 20 to 50.

Such compounds are described more particularly in U.S. Pat. No.4,185,087.

A compound falling within this class is the product sold by the companyUnion Carbide under the name Ucar Silicone ALE 56.

(c) quaternary ammonium silicones especially of formula (XIX):

in which:

R₇, which may be identical or different, represent a monovalenthydrocarbon-based group containing from 1 to 18 carbon atoms, and inparticular a C₁-C₁₈ alkyl group, a C₂-C₁₈ alkenyl group or a ringcomprising 5 or 6 carbon atoms, for example methyl,

R₆ represents a divalent hydrocarbon-based group, especially a C₁-C₁₈alkylene group or a divalent C₁-C₁₈, and for example C₁-C₈, alkylenoxygroup linked to the Si via an SiC bond,

R₈, which may be identical or different, represent a hydrogen atom, amonovalent hydrocarbon-based group containing from 1 to 18 carbon atoms,and in particular a C₁-C₁₈ alkyl group, a C₂-C₁₈ alkenyl group or agroup —R₆—NHCOR₇;

X⁻ is an anion such as a halide ion, especially chloride, or an organicacid salt (acetate, etc.);

r represents a mean statistical value from 2 to 200 and in particularfrom 5 to 100.

These silicones are described, for example, in patent application EP-A-0530 974.

d) the amino silicones of formula (XX) below:

in which:

-   -   R₁, R₂, R₃ and R₄, which may be identical or different, denote a        C₁-C₄ alkyl group or a phenyl group,    -   R₅ denotes a C₁-C₄ alkyl group or a hydroxyl group,    -   n is an integer ranging from 1 to 5,    -   m is an integer ranging from 1 to 5, and    -   x is chosen such that the amine number is between 0.01 and 1        meq/g.

When these compounds are used, one particularly advantageous embodimentinvolves their combined use with cationic and/or nonionic surfactants.

By way of example, use may be made of the product sold under the nameCationic Emulsion DC939 by the company Dow Corning, a cationicsurfactant, namely trimethylcetylammonium chloride and a nonionicsurfactant of formula C₁₃H₂₇—(OC₂H₄)₁₂—OH, known under the CTFA name“Trideceth-12”.

Another commercial product that may be used according to the inventionis the product sold under the name Dow Corning Q2 7224 by the companyDow Corning, comprising, in combination, trimethylsilyl amodimethiconeof formula (XVI) described above, a nonionic surfactant of formulaC₈H₁₇—C₆H₄—(OCH₂CH₂)₄₀—OH, known under the CTFA name Octoxynol-40, asecond nonionic surfactant of formula C₁₂H₂₅—(OCH₂—CH₂)₆—OH, known underthe CTFA name Isolaureth-6, and propylene glycol.

The silicones of the invention may also be silicone is grafted withanionic groups, such as the compounds VS 80 or VS 70 sold by the company3M.

In a more preferred embodiment, the silicone is a chemically unmodifiedpolydimethylsiloxane.

The silicone(s) may be present in contents ranging from 0.01% to 40% byweight and preferably from 0.1% to 5% by weight relative to the totalweight of the composition.

The composition may also comprise one or more solid particles. Amongthese solid particles, antidandruff agents such as zinc pyridinethione,selenium disulfide and ellagic acid, fillers, and especially silica,titanium dioxide, pigments, dyes, abrasive powders such as pumice andapricot kernel powder may be present in the composition according to theinvention.

The composition according to the present invention may also contain oneor more reducing agents, especially such as sulfureous reducing agents.These agents are preferably chosen from organic compounds comprising oneor more mercapto groups (—SH), sulfites and sulfite derivatives.

The term “sulfite derivatives” essentially denotes bisulfites andsulfite diesters of formula ROSO₂R′, with R and R′ denoting C₁-C₁₀ alkylgroups.

The organic compounds comprising a mercapto group are preferably chosenfrom the following compounds: thioglycolic acid, thiolactic acid,cysteine, homocysteine, glutathione, thioglycerol, thiomalic acid,2-mercaptopropionic acid, 3-mercaptopropionic acid, thiodiglycol,2-mercaptoethanol, dithiothreitol, thioxanthine, thiosalicylic acid,thiodiglycolic acid, lipoic acid, N-acetylcysteine, and thioglycolic orthiolactic acid esters, and mixtures of these compounds.

The sulfureous reducing agent(s) may be used especially in the form ofsalts, in particular alkali metal salts such as sodium and potassiumsalts, alkaline-earth metal salts, for example magnesium and calciumsalts, ammonium salts, amine salts and amino alcohol salts.

In a particularly preferred manner, the sulfureous reducing agent(s) arechosen from thioglycolic acid and salts thereof, thiolactic acid andsalts thereof, alkali metal sulfites and especially sodium sulfite,alkali metal bisulfites and especially sodium bisulfite, and precursorsof these sulfites or bisulfites such as sodium metabisulfite.

The sulfureous reducing agent(s) may be present in an amount rangingfrom 0.1% to 5% by weight and especially from 0.3% to 3% by weightrelative to the total weight of the composition.

The composition in accordance with the invention may also comprise atleast one oxidizing agent.

Such an oxidizing agent is preferably chosen from the group formed byhydrogen peroxide, urea peroxide, alkali metal bromates orferricyanides, and persalts such as perborates and persulfates.

The use of hydrogen peroxide is particularly preferred.

According to one preferred embodiment, the composition according to theinvention may also comprise one or more cationic polymers.

The composition according to the invention may be aqueous or anhydrous.

The term “anhydrous” refers to a composition not containing any addedwater, i.e. a composition in which the water that may be present comesonly from the water of crystallization or of adsorption of the startingmaterials. In any case, an anhydrous composition contains less than 5%by weight of water and preferably less than 1% by weight of waterrelative to the total weight of the composition.

Whether it is anhydrous or aqueous, the composition according to theinvention may contain one or more organic solvents that are liquid atroom temperature (25° C.) and at atmospheric pressure (760 mmHg, i.e.1.013×10⁵ Pa). Preferably, the liquid organic solvent(s) are chosen fromC₁-C₄ lower alcohols, such as ethanol, isopropanol, tert-butanol orn-butanol, polyols such as propylene glycol, polyol ethers, C₅-C₁₀alkanes, C₃-C₄ ketones such as acetone and methyl ethyl ketone, C₁-C₄alkyl acetates such as methyl acetate, ethyl acetate and butyl acetate,dimethoxyethane, diethoxyethane, silicone oils and the non-siliceousliquid fatty substances described above, and mixtures thereof.

When the composition of the invention is aqueous, its pH is generallybetween 2 and 9 and in particular between 3 and 8. Preferably, the pH isless than 7. Even more preferentially, it ranges from 3 to 6.

It may be adjusted to the desired value by means of acidifying orbasifying agents usually used in cosmetics for this type of application,or alternatively using standard buffer systems.

Among the acidifying agents, examples that may be mentioned include theorganic acids already mentioned previously, or mineral acids.

The term “mineral acid” means any acid derived from a mineral compound.Among the mineral acids, mention may be made of hydrochloric acid,orthophosphoric acid, sulfuric acid, sulfonic acids and nitric acid.

Use may be made especially of mineral or organic acids such ashydrochloric acid, orthophosphoric acid, sulfuric acid, carboxylicacids, for instance acetic acid, tartaric acid, citric acid or lacticacid, and sulfonic acids.

Among the basifying agents, examples that may be mentioned includeaqueous ammonia, alkali metal carbonates, alkanolamines, such as mono-,di- and triethanolamines and derivatives thereof, sodium hydroxide,potassium hydroxide and the compounds of the following formula:

in which W is a propylene residue optionally substituted with a hydroxylgroup or a C₁-C₄ alkyl group; R_(a), R_(b), R_(c) and R_(d), which maybe identical or different, represent a hydrogen atom or a C₁-C₄ alkyl orC₁-C₄ hydroxyalkyl group.

Preferably, the pH modifiers may be chosen from alkaline agents such asaqueous ammonia, monoethanolamine, diethanolamine, triethanolamine,1,3-propanediamine or an alkaline hydroxide, such as2-amino-2-methyl-1-propanol, or from acidifying agents such asphosphoric acid or hydrochloric acid.

The compositions according to the invention may also comprise one ormore additives chosen from fixing polymers, pseudoceramides, vitaminsand provitamins, including panthenol, water-soluble or liposoluble,silicone or non-silicone sunscreens, nacreous agents and opacifiers,sequestrants, conditioning agents other than the silicones and cationicpolymers mentioned previously, solubilizers, antioxidants, antidandruffagents other than those mentioned above, anti-seborrhoeic agents,hair-loss counteractants and/or hair restorers, penetrants, fragrances,peptizers and preserving agents, or any other additive conventionallyused in the cosmetics field.

These additives can be present in the composition according to theinvention in an amount ranging from 0 to 20% by weight, with respect tothe total weight of the composition.

A person skilled in the art will take care to select the optionaladditives and the amounts thereof such that they do not harm theproperties of the compositions of the present invention.

The present invention also relates to a cosmetic process for thetreatment of keratin materials, which consists in applying to saidmaterials an effective amount of a composition as described above.

This application may or may not be followed by a rinsing operation.

When the application of the composition is followed by rinsing, theleave-on time of the composition on the keratin materials ranges from afew seconds to 60 minutes, better still from 5 seconds to 30 minutes,even better still from 10 seconds to 10 minutes.

Whether in rinse-out mode or leave-in mode, the application of thecomposition may take place in the presence or absence of heat especiallyin the case of hair-care. The heating device may be a hairdryer, a hooddryer, a curling iron or a flat iron. The heating temperature may bebetween 40° C. and 220° C.

The application of the composition according to the invention to thehair may take place on dry hair or on wet hair. It may in particular becarried out after a shampooing operation or after a pretreatment atacidic or basic pH.

The examples that follow serve to illustrate the invention without,however, being limiting in nature.

EXAMPLES

In the following examples, all the amounts are shown as percentage byweight of active material, with respect to the total weight of thecomposition.

Example 1

A composition according to the invention (composition A) is comparedwith a comparative composition (composition B) not comprising anyfatty-chain alkoxysilane of formula (I).

Composition A according to the invention and composition B outside theinvention were prepared according to the formulations given in the abovetable.

A B Octyltriethoxysilane (1)  10% — Dipalmitoylethylhydroxyethylammonium0.2% 0.2% methosulfate (2) Hydroxyethylcellulose (3) 0.6% 0.6% Lacticacid   2%   2% Water qs 100% qs 100% (1) sold under the name DynasylanOcteo by the company Evonik. (2) sold under the name Dehyquart F 30 bythe company Cognis. (3) sold under the name Natrosol 250 HHR PC by thecompany Ashland.

Treatment:

The above compositions were tested on a panel of 10 women with dyedhair. Depending on the length of the hair, from 5 to 10 g of each ofthese compositions were applied per half-head. The application wasperformed on wet hair after shampooing, without a leave-on time, at roomtemperature, followed by rinsing, drying and blow-drying of the hair.

The treatments performed with composition A according to the inventionshow very good working qualities, especially such as ease of applicationand of rinsing, and also a very good feel quality after rinsing.

Results:

Sensory Analysis:

A panel of experts then performed a comparative evaluation betweencompositions A and B, giving a grade ranging from 0 (poor) to 5 (verygood) for each of the cosmetic properties of the hair, listed in thetable below. This study was performed on wet hair. The averages of thegrades obtained are as follows:

A B Disentangling 4.8 3.5 Suppleness 4.1 2.8 Smoothness 4.2 3.1

These results show that the treatment with composition A of theinvention affords more ease of disentangling and suppleness on wet hair.

These results also show that the hair is smoother with composition A inaccordance with the invention.

A study of shampoo-resistance of the cosmetic effects observed onapplication was also performed.

A panel of experts performed a comparative evaluation as regards thedurability of the cosmetic properties, the suppleness and the smoothnessobtained with composition A on wet hair. This evaluation was performedby attributing to each property a grade ranging from 0 (poor) to 5 (verygood). The averages of these grades are collated in the table below:

On application After 10 shampoo washes Suppleness 4.1 3.7 Smoothness 4.23.8

These results show that the performance qualities of composition Aaccording to the invention are remanent and in particular remainsuperior to the performance qualities obtained immediately afterapplication of the comparative composition B.

Examples 2 to 4

Compositions according to the invention were prepared from the compoundsindicated in the table below.

Octyltriethoxysilane 10%  Cationic surfactant 3% Hydroxyethylcellulose1% Lactic acid 2% Water qs 100%

In Examples 2, 3 and 4, the cationic surfactant is, respectively,behenyltrimethylammonium chloride sold under the name Genamin KDMP bythe company Clariant, cetyltrimethylammonium chloride sold under thename Dehyquart A OR by the company Cognis ordipalmitoylethylhydroxyethylammonium methosulfate sold under the nameDehyquart F 30 by the company Cognis.

Example 5

A composition according to the invention (composition A′) was comparedwith a comparative composition (composition B′) not comprising anyfatty-chain alkoxysilane of formula (I).

Composition A′ according to the invention and composition B′ outside theinvention were prepared according to the formulations given in the abovetable.

A′ B′ Octyltriethoxysilane (1)  10% — Cocoglucoside (2) 2.5% 2.5%Hydroxyethylcellulose (3) 0.6% 0.6% Lactic acid   2%   2% Sodiumhydroxide qs pH 3.5 qs pH 3.5 Water qs 100% qs 100% (1) sold under thename Dynasylan Octeo by the company Evonik. (2) sold under the namePlantacare 818 UP by the company Cognis. (3) sold under the nameNatrosol 250 HHR PC by the company Ashland.

Treatment:

The above compositions were tested on a panel of 10 models with dyedhair. After a shampoo wash, composition A′ was applied on wet hair to ahalf-head and composition B′ to the other half-head, at a rate of 8 g ofeach of the compositions A′ and B′.

Results:

Sensory Analysis:

On the day of the application, a panel of experts graded on a scaleranging from 0 (poor) to 5 (very good) the cosmetic performancequalities of compositions A′ and B′ in terms of disentangling,suppleness, smoothness and individualization on wet hair, after rinsing.The averages of the grades obtained for each of these criteria arecollated in the table below:

A′ B′ Disentangling 4.3 1.8 Suppleness 4.2 2.4 Smoothness 4.5 1.7Individualized 4.5 1.8

These results show that the treatment with composition A′ of theinvention affords more ease of disentangling, suppleness andindividualization on wet hair.

These results also show that the hair is smoother with composition A′ inaccordance with the invention.

A study of shampoo-resistance of the cosmetic effects observed onapplication was also performed.

After performing 10 standard shampoo washes, the cosmetic performancequalities of composition A′ according to the invention were re-evaluatedby a panel of experts. The table below shows the averages of the gradesobtained on the day of application, and then after 10 shampoo washes.

On application After 10 shampoo washes Smoothness 4.5 4.0 Individualized4.5 4.0

These results show that the performance qualities of composition A′according to the invention are remanent and in particular remainsuperior to the performance qualities obtained immediately afterapplication of the comparative composition B′.

1.-17. (canceled)
 18. A cosmetic composition comprising: at least about 0.1% by weight, relative to the total weight of the composition, of at least one fatty-chain alkoxysilane of formula (I) below: R₁Si(OR₂)₃  (I) in which R₁ represents a linear or branched alkyl or alkenyl group comprising from 7 to 18 carbon atoms, and R₂ represents a linear or branched alkyl group comprising from 1 to 6 carbon atoms, and at least one surfactant chosen from cationic surfactants, nonionic surfactants, and mixtures thereof.
 19. The composition according to claim 18, wherein R₂ represents an ethyl group.
 20. The composition according to claim 18, wherein the at least one fatty-chain alkoxysilane is chosen from octyltriethoxysilane, dodecyltriethoxysilane, octadecyltriethoxysilane and hexadecyltriethoxysilane.
 21. The composition according to claim 18, wherein the at least one fatty-chain alkoxysilane is present in an amount ranging from about 0.1% to about 20% by weight, relative to the total weight of the composition.
 22. The composition according to claim 18, wherein the at least one surfactant is chosen from cationic surfactants chosen from: a) quaternary ammonium salts of formula (II) below:

in which the groups R₈ to R₁₁, which may be identical or different, represent a linear or branched aliphatic group comprising from 1 to 30 carbon atoms or an aromatic group, at least one of the groups R₈ to R₁₁ comprising from 8 to 30 carbons, and X⁻ is an ion chosen from halides, phosphates, lactates, (C₁-C₄)alkyl sulfates, (C₁-C₄)alkylsulfonates, and (C₁-C₄)alkylarylaulfonates; b) quaternary ammonium salts of imidazoline of formula (III) below:

in which R₁₂ represents an alkyl or alkenyl group comprising from 8 to 30 carbon atoms, R₁₃ represents a hydrogen atom, a C₁-C₄ alkyl group or an alkyl or alkenyl group comprising from 8 to 30 carbon atoms, R₁₄ represents a C₁-C₄ alkyl group, R₁₅ represents a hydrogen atom or a C₁-C₄ alkyl group, and X⁻ is an anion chosen from halides, phosphates, acetates, lactates, (C₁-C₄)alkyl sulfates and (C₁-C₄)alkylaryl-sulfonates; c) quarternary diammonium or triammonium salts of formula (IV) below:

in which R₁₆ denotes an alkyl group comprising about 16 to 30 carbon atoms, optionally hydroxylated and/or interrupted with at least one oxygen atom; R₁₇ is chosen from hydrogen, an alkyl group comprising from 1 to 4 carbon atoms or a group —(CH₂)₃—N⁺(R_(16a))(R_(17a))(R_(18a)); R_(16a), R_(17a), R_(18a), R₁₈, R₁₉, R₂₀ and R₂₁, which may be identical or different, are chosen from hydrogen and an alkyl group comprising from 1 to 4 carbon atoms, and X⁻ is an anion chosen from halides, acetates, phosphates, nitrates, (C₁-C₄)alkyl sulfates and (C₁-C₄)alkylaryl-sulfonates; d) quaternary ammonium salts of the following formula (V) comprising at least one ester functional group:

in which: R₂₂ is chosen from C₁-C₆ alkyl and C₁-C₆ hydroxyalkyl or dihydroxyalkyl groups; R₂₃ is chosen from: the group

linear or branched, saturate or unsaturated C₁-C₂₂ hydrocarbon-based groups R₂₇, a hydrogen atom, R₂₅ is chosen from: the group

linear or branched, saturated or unsaturated C₁-C₆ hydrocarbon-based groups R₂₉, a hydrogen atom, R₂₄, R₂₆ and R₂₈, which may be identical or different, are chosen from linear or branched, saturated or unsaturated C₇-C₂₁ hydrocarbon-based groups; r, s and t, which may be identical or different, are integers ranging from 2 to 6, r1 and t1, which may be identical or different, are equal to 0 or 1, r2+r1=2r and t1+t2=2t, y is an integer ranging from 1 to 10, x and z, which may be identical or different, are integers ranging from 0 to 10, X⁻ is a simple or complex, organic or mineral anion, with the proviso that the sum of x+y+z is from 1 to 15, that when x is 0, then R₂₃ denotes R₂₇ and that when z is 0, then R₂₅ denotes R₂₉.
 23. The composition according to claim 22, wherein the at least one cationic surfactant is chosen from behenyltrimethylammonium chloride, cetyltrimethylammonium chloride, and dipalmitoylethylhydroxyethylammonium methosulfate.
 24. The composition according to claim 18, wherein the at least one surfactant is chosen from cationic surfactants present in an amount of at least about 0.05% by weight relative to the total weight of the composition.
 25. The composition according to claim 18, wherein the at least one surfactant is chosen from nonionic surfactants chosen from: Polyethoxylated, polypropoxylated and/or polyglycerolated alcohols, α-diols and (C₁-C₂₀)alkylphenols, containing at least one fatty chain comprising from 8 to 18 carbon atoms, the number of ethylene oxide and/or propylene oxide groups ranging from 2 to 50, and the number of glycerol groups ranging from 2 to 30, Copolymers of ethylene oxide and propylene oxide, optionally oxyethylenated fatty acid esters or sorbitan, fatty acid esters of sucrose, polyoxyalkylenated fatty acid esters, optionally oxyalkylenated alkylpolyglycosides, alkylglucoside esters, derivatives of N-alkylglucamine and of N-acylmethylglucamine, aldobionamides and amine oxides.
 26. The composition according to claim 18, wherein the at least one surfactant is chosen from nonionic surfactants present in an amount at least about 0.1% by weight.
 27. The composition according to claim 18, wherein the at least one surfactant is chosen from cationic surfactants, and wherein the weight ratio of the at least one fatty-chain alkoxysilane to the at least one cationic surfactant is greater than or equal to about
 1. 28. The composition according to claim 27, wherein the weight ratio ranges from about 2 to about
 20. 29. The composition according to claim 18, wherein the at least one surfactant is chosen from nonionic surfactants, and wherein the weight ratio of the at least one nonionic surfactant to the fatty-chain alkoxysilane is greater than or equal to about 0.05.
 30. The composition according to claim 18, further comprising at least one thickener.
 31. The composition according to claim 30, wherein the at least one thickener is present in an amount ranging from about 0.01% to about 20% by weight relative to the total weight of the composition.
 32. The composition according to claim 30, wherein the at least one thickener is formed from hydroxyethylcellulose.
 33. The composition according to claim 18, further comprising at least one organic acid chosen from acetic acid, propanoic acid, butanoic acid, lactic acid, malic acid, glycolic acid, ascorbic acid, maleic acid, phthalic acid, succinic acid, taurine, tartaric acid, glycine, glucuronic acid, gluconic acid and citric acid, wherein the at least one organic acid is present in an acid content expressed as free acids ranging from about 0.01% to about 10% by weight.
 34. The composition according claim 18, further comprising at least one additive chosen from alkoxysilanes other than those of formula (I), non-siliceous fatty substances, silicones, solid particles, reducing agents and oxidizing agents.
 35. The composition according to claim 18, wherein the composition is aqueous.
 36. The composition according to claim 18, wherein the composition is anhydrous.
 37. A cosmetic process for treating keratin materials comprising: applying to the keratin materials a cosmetic composition comprising: at least about 0.1% by weight, relative to the total weight of the composition, of at least one fatty-chain alkoxysilane of formula (I) below: R₁Si(OR₂)₃  (I) in which R₁ represents a linear or branched alkyl or alkenyl group comprising from 7 to 18 carbon atoms, and R₂ represents a linear or branched alkyl group comprising from 1 to 6 carbon atoms, and at least one surfactant chosen from cationic surfactants, nonionic surfactants and mixtures thereof; and then optionally rinsing the composition out after a leave-on time, in the presence or absence of heat. 